I am trying to go for all of the achievements and one of the only ones i have left is getting to level 20... so stupid. It generally falls into two categories, i wipe the wall with the enemy and they leave before i get the points or they use a character with only one attack. For instance, cervantes users keep using the teleport above the player attack and with the huge lag in the online multiplayer i can't counter the attack, all i can do is block. I am pretty sure i will never get the stupid achievement because pricks just do the same attack over and over again. Oh and i can't forget the modded character that have complete max stats... Cervantes took no damage and every hit took out half a bar of health. Screw noobs that need to repeat attacks when they are about to lose

Cervantes' 4B+K is easy to GI on reaction, but considering the lag, I guess the best thing you can do is to sidestep often and he will whiff his attack. Other than that, I don't know how else to help you.

First thing, the people who play live, who can beat you, probably have gained the skill over time. It might be hard to beat them if you're level 15, and they are level 100. It's a big gap of skill. I just suggest building up whatever skill you might currently have and keep trying. Learn from your mistakes. If you keep getting killed the same way, try to find a way to counter it.